batch processing mac/linux: adds find command - for #207 (#220)

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@@ -1267,6 +1267,8 @@
           <p>The basic pattern will look similar to this:<br>
           <code>for item in *.ext; do ffmpeg -i $item <i>(ffmpeg options here)</i> "${item%.ext}_suffix.ext"</code></p>
           <p>e.g., if an input file is bestmovie002.avi, its output will be bestmovie002_suffix.avi.</p>
+          <p>Variation: recursively process all MXF files in subdirectories using <code>find</code> instead of <code>for</code>:</p>
+          <p><code>find input_directory -iname "*.mxf" -exec ffmpeg -i {} -map 0 -c copy {}.mov \;</code></p>
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